Naltrexone blocks your brain’s opioid receptors, reducing the reward and pleasure you feel from drinking. Because alcohol boosts opioid signaling, blocking that pathway dampens dopamine-driven reward and cuts cravings. You won’t get sick if you drink, but you’ll likely notice less urge and fewer heavy-drinking days. It comes as a daily oral pill or a monthly Vivitrol injection, and works best alongside therapy. Here’s what you should know before you start.
Key Takeaways
- Naltrexone blocks mu-opioid receptors, reducing alcohol’s rewarding effects and dampening dopamine-related reward signaling, which lowers craving and pleasure from drinking.
- Evidence most strongly supports reducing heavy drinking and binge days rather than guaranteeing complete abstinence.
- It comes in two forms: a once-daily oral pill and a monthly extended-release injection (Vivitrol).
- Common early side effects include nausea, headache, dizziness, fatigue, and reduced appetite, with possible injection-site reactions.
- Best outcomes occur when naltrexone is combined with therapy, consistent adherence, and liver function monitoring.
What is naltrexone for alcohol use
How does naltrexone treat alcohol use disorder? Naltrexone works as an opioid receptor antagonist, acting primarily at the mu-opioid receptor. When you drink, alcohol increases endogenous opioid signaling, and naltrexone blocks that pathway. By interrupting this signaling, it reduces alcohol’s rewarding and reinforcing effects and indirectly dampens dopamine-related reward signaling in your brain. The result is less craving and less pleasure from drinking.
You should understand what naltrexone realistically offers. The strongest evidence supports reducing heavy drinking rather than guaranteeing abstinence. Clinical trials and reviews show fewer binge-drinking days and fewer drinks per drinking day. Relapse to heavy drinking decreases when you pair it with psychosocial treatment, and craving commonly declines during therapy. Your benefit is strongest when you maintain consistent medication adherence.
How naltrexone works to reduce cravings
Naltrexone eases your cravings by working as an opioid receptor antagonist, binding primarily to your mu-opioid receptors. When you drink, alcohol increases endogenous opioid signaling in your brain. Naltrexone blocks that pathway, so the signal doesn’t get through.
This matters because that opioid signaling drives alcohol’s rewarding and reinforcing effects. By blocking it, naltrexone indirectly dampens dopamine-related reward signaling too. The practical result is that drinking gives you less pleasure, which lowers the drive to keep drinking.
As those rewarding effects fade, your cravings commonly decrease during treatment. You’re also better able to pause or stop after one or two drinks. This benefit is strongest when you take the medication consistently, since adherence directly supports craving reduction.
What the oral pill and Vivitrol injection options are
Naltrexone comes in two formulations: an oral pill and an extended-release injection sold as Vivitrol. You take the oral pill once daily, and some treatment plans start you on a lower dose before advancing to the full dose. The injectable version delivers extended-release naltrexone about once monthly, which removes the need for daily dosing.
Your choice often depends on adherence needs and clinical context. If you struggle to take a pill consistently, the monthly injection may support better outcomes. Your clinician typically assesses your liver function before you start either option, then continues monitoring it during treatment. Both formulations work through the same mechanism, so the difference comes down to how you’d prefer to receive the medication.
How the two forms compare
The two forms compare most in how you take them and how that affects adherence. The oral pill puts control in your hands daily, and the injection delivers a steady dose over about a month, removing the need to remember a pill.
| Oral Naltrexone | Extended-Release Injection |
|---|---|
| Taken once daily | Given about once monthly |
| Depends on daily adherence | Removes daily dosing decisions |
| May start at a lower dose | Delivered as a full monthly dose |
| Easy to stop if needed | Effect persists until it clears |
| Self-administered | Administered by a clinician |
Your choice often hinges on adherence needs and clinical context. If you struggle to take medication consistently, the injection can support steadier outcomes.
What to expect when starting naltrexone
The early weeks on naltrexone involve some preparation and manageable side effects. Before starting, expect liver function testing, since naltrexone can affect hepatic enzymes. You mustn’t be using opioids, as naltrexone blocks them and can precipitate withdrawal. Some plans begin with a lower oral dose before moving to the full dose.
Early on, nausea is the most common effect you might notice. Headache, dizziness, fatigue, sleepiness, reduced appetite, or stomach upset can also occur. With the injection, expect possible injection-site reactions. Most of these are mild to moderate and often improve with time.
Don’t expect a disulfiram-like reaction if you drink; naltrexone won’t trigger severe immediate illness. Instead, watch for reduced craving and less pleasure from drinking.
Why naltrexone works best combined with therapy
Naltrexone works best combined with therapy because the medication reduces cravings and blunts alcohol’s rewarding effects, but it doesn’t address the behavioral patterns, triggers, and thought processes that drive drinking. Therapy fills that gap. Clinical trials show that relapse to heavy drinking drops when you combine naltrexone with psychosocial treatment, and that adherence improves too. Counseling helps you build coping strategies, recognize high-risk situations, and stay motivated during difficult stretches. It also reinforces your commitment to taking the medication consistently, which is where naltrexone’s benefit is strongest. Think of the medication as reducing the biological pull toward alcohol while therapy strengthens your skills and resolve. Together, they produce better, more durable outcomes than either does alone.
How Fortify Wellness uses naltrexone in alcohol treatment
Fortify Wellness uses naltrexone as part of a structured treatment plan built around your clinical needs and adherence goals. Before starting, we assess your liver function and confirm you’re not using opioids, since current opioid use or acute hepatitis rules out treatment. We’ll help you choose between once-daily oral naltrexone and the monthly extended-release injection, matching the formulation to your adherence needs and clinical context. When appropriate, we start with a lower oral dose before advancing to the full dose. We monitor hepatic enzymes during treatment and track your drinking patterns, cravings, and side effects. Because the medication works best alongside psychosocial support, we pair it with counseling or structured support. This combined approach targets fewer heavy-drinking days and reduced total alcohol intake over time.
Explore Medication for Alcohol Use
Naltrexone can help reduce alcohol cravings and the rewarding effects of drinking as part of treatment for alcohol use disorder. Fortify Wellness provides alcohol addiction treatment where medication options can be considered alongside behavioral treatment based on your needs.
Call (818) 918-9564 to discuss alcohol treatment and whether medication may be appropriate for you.
Frequently Asked Questions
How Long Do I Need to Take Naltrexone?
There is no standard duration for naltrexone treatment. Some people take it for several months, while others continue longer based on their treatment goals, drinking patterns, cravings, and response to the medication. Your healthcare provider can regularly review whether continuing treatment is appropriate. Do not stop or change your medication without discussing it with your prescriber.
Can I Drink Alcohol While Taking Naltrexone?
Naltrexone does not cause the severe alcohol reaction associated with disulfiram, so drinking alcohol while taking it does not typically cause that type of reaction. However, naltrexone is not intended to make drinking safe. It can reduce the rewarding effects of alcohol and may help reduce heavy drinking and cravings, but you can still become intoxicated and experience alcohol-related harm. Follow your treatment plan and discuss continued drinking with your healthcare provider.
Is Naltrexone Safe to Use During Pregnancy?
Naltrexone is not generally the first choice for treating alcohol use disorder during pregnancy because there is limited evidence about its safety during pregnancy. The decision to start or continue it should be made with your healthcare provider after weighing the potential benefits and risks. Do not start or stop naltrexone during pregnancy without medical guidance.
What Happens if I Need Surgery or Pain Medication?
Tell your surgeon, anesthesiologist, dentist, and other healthcare providers that you take naltrexone before receiving treatment that may require opioid pain medication. Naltrexone blocks opioid receptors and can reduce the effectiveness of opioid pain medicines. For planned procedures, your medical team can determine whether naltrexone should be temporarily discontinued and develop an appropriate pain-management plan. Do not stop it on your own.
Does Insurance Typically Cover Naltrexone for Alcohol Treatment?
Naltrexone may be covered by health insurance when prescribed for alcohol use disorder, but coverage depends on your plan, medication type, provider, and pharmacy benefits. Oral naltrexone is available as a generic medication, while extended-release injectable naltrexone may have different coverage and authorization requirements. Check your plan for deductibles, copays, prior authorization, and network requirements before starting treatment.